PROJ00106

• Contract/PO #: C153494
• Contractor Name: Loveland, City of
• Water District: 0
• County: Larimer
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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the Northern Colorado Vater Conservancy District (NCVCD) and the Municipal

Subdistrict of the NCVCD in partnership with the Bureau of Reclamation.

The projects transport CBT and Vindy Gap water across the Continental

Divide and deliver that water to shareholders along the Front Range in

northeastern Colorado.

In the Phase I study, water supplies available from the City's four major
water sources were compared to forecasted water demand for three population
growth rates shown in Table 1. The total quantity of water available from
these sources was compared to projected demands to determine the magnitude
of the water supply surplus or deficit for recurrence intervals of 25, 50,
100, and 200 years.

The Phase I study concluded that water supply deficits would be encountered

at one or more of these recurrence intervals when the average annual demand

equaled or exceeded approximately 15,700 acre-feet (ac-ft). COM

recommended that the City develop sufficient water supplies to eliminate

projected deficits at the 100-year recurrence interval for an annual demand

of 21,261 ac-ft; this demand corresponded to a 30 year planning horizon

under the moderate growth rate scenario (i.e., 3.5 percent increase in

demand/year).

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The City directed COM to conduct the Phase II study to evaluate
alternatives which could be implemented to eliminate the deficits at the
recommended recurrence interval and demand conditions. A set of "Design
Conditions" was defined as the projected water supply sources and demands
to be used as the basis for evaluating alternative water supply options.
The specific Design Conditions are summarized in Table 2. The methodology
for performing the Phase II evaluations is described below.

Evaluation of Operational Factors - Computer models were developed in Phase
I to simulate the monthly operation of the City's water supply system using
1000-year synthetic streamflow records developed for the CBT and Vindy Gap
projects and the Big Thompson River. These models were modified in Phase

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